Activity Report 2005 - International Foundation High Altitude ...

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International Foundation HFSJG Activity Report 2005 Institute MeteoSchweiz CH-8044 Zürich Universität Heidelberg Institut für Umweltphysik D-69120 Heidelberg Institut für atmosphärische Radioaktivität, D-Freiburg i.B. and Climate and Environmental Physics, University of Bern Bundesamt für Gesundheit CH-1700 Freiburg VAW Laboratory of Hydraulics, Hydrology and Glaciology ETH Zürich CH-8092 Zürich Physikalisch-Meteorologisches Observatorium Davos World Radiation Center CH-7260 Davos Dorf Abteilung für Klima- und Umweltphysik, Physikalisches Institut, Universität Bern Experiment / Measurements Weather observations CO 2 and 14 CO 2 measurements Weekly collection Krypton samples Krypton 85 measurements Measurements of radioactivity: RADAIR NADAM Glacier measurements Solar and terrestrial radiation measurements CarboEurope-IP: Assessment of the European Terrestrial Carbon Balance 4
International Foundation HFSJG Activity Report 2005 Name of research institute or organization: Institut d’Astrophysique et de Géophysique, Université de Liège Title of project: High resolution, solar infrared Fourier Transform Spectrometry. Application to the study of the Earth atmosphere Project leader and team: Luc Delbouille (em.), Philippe Demoulin, Pierre Duchatelet, Emmanuel Mahieu, Ginette Roland (em.), Christian Servais (project leader), Rodolphe Zander (em.) Jacqueline Bosseloirs, Guy Buntinx, Olivier Flock, Vincent Van De Weerdt, Diane Zander Project description: The main activity of the Liège group at the Jungfraujoch was the continuation of the long-term monitoring of the Earth atmosphere. The observations achieved by the two high-performance infrared spectrometers allow to routinely derive abundances of more than 20 constituents related to the erosion of the ozone layer in the stratosphere (HCl, ClONO 2 , HNO 3 , NO, NO 2 , HF, COF 2 , O 3 …), monitored in the frame of the Kyoto protocol (N 2 O, CH 4 , CO 2 , SF 6 , CCl 2 F 2 , CHClF 2 , CCl 3 F…) or affecting the oxidization processes in the troposphere (CO, C 2 H 2 , C 2 H 6 , OCS, HCN, H 2 CO…). The resulting databases allow the determination of the short-term variability, seasonal modulations, as well as long-term changes affecting most of these species. During 2005, Liège observers spent 247 days at the Jungfraujoch. Good weather conditions enabled observations on 124 days. For a number of the species listed above, a complete re-analysis of the archived spectra is currently under way with SFIT-2, a recent retrieval algorithm that provides in most cases information on the distribution of the molecules versus altitude. This algorithm allows determining partial columns (e.g. to distinguish between tropospheric and stratospheric contents) as well as more accurate total columns. In the frame of the EC project UFTIR (http://www.nilu.no/uftir), a homogenised optimal retrieval strategy has been developed for the inversion of O 3 , N 2 O, C 2 H 6 , HCFC-22, CO and CH 4 . The corresponding Jungfraujoch spectra between 1995 and 2004 have been reprocessed, after implementation of this new strategy, and the resulting time series are being archived on the UFTIR database at NILU. The UFTIR outcomes are shared with the NDSC infrared community. As an example, Figure 1 shows the results of the FTIR retrievals for carbon monoxide CO, compared to the Jungfraujoch in situ CO measurements by EMPA. The agreement between both datasets is rather good, showing similar seasonal and short term variations. CO anomalies observed in the northern hemisphere in 1998- 1999, 2002 and 2003 are clearly visible. These anomalies have recently been investigated [Yurganov et al., 2005] and the corresponding extra CO emissions have been evaluated to 95 and 130 Tg, respectively in 2002 and 2003. Strong boreal fires that occurred in Russia during these two years are the most likely causes for the observed CO burden increases. 5
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Address: School of Earth, Atmospher
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